Steam-boiler furnace.



C. FREIHOFEH.

STEAM BOILER FURNACE.

APPucATxoN FILED MAR. 3. 19m

Patented 0st. 23, 1917.

2 SHEETS-SHEET 2.

Q- ygwom CHARLES EREIIOFER, PHILADELP-IA, PENNSYLVANTA.

STEAM-Bonne Yrumvacn.

Application filed March 3, 1915;

To @ZZ 107mm it may concern.'

Be it known thatLCHARLns FREIHOFER, a citizen of the ylvlnited States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Steaiii-BoilerFurhaces, of which the following is a specication.r

@ne object of `my invention is to provide a; novel construction and arrangement of parts for use in connection with 'or as part of a i'iluralityof steam boiler or .other furnaces, vhereby the discharge of smoke from the stack is eectually prevented, thek invention contemplating' such a structure as will canse thecomhustible'gases and smoke given off from a green fire in one furnace to'V be passed into or through a body of 4fuel Which has been burning for some time in a second furnace, beforebeing allovved to pass to the stack. L l

Another objectfof the invention is to provide a novel arrangement of flues anddampers for use in connection With'a plurality of boiler furnaces whereby the gasesland smoke given off from a freshly red 'furnace may be caused yto pass through a body of fuelin a furnace which has been firedfor some time and Whose `products'of combustion are led directly to a stack flue, the rarrangement being :such that When the second furnace is tired its combustible gases and smoke are caused to pass through the fuel inthe iirst furnace Whose products of combustion are then delivered into the stack flue.

The invention also contemplates a novel arrangement of iiues and dampers for causing the gases passing from one furnace to be directed at Will either directly into a stack or into a flue leading to another furnace. f

These objects and other advantageous ends l secure as hereinafter set forth, reference being had to the accompanying drawings in which,

Figure l is a vertical section'of a steam boiler constructed according to my invention; f

Fig. 2 is a horizontal section on the line rif-n, F' 1k;

F ig. o is a perspective vienT illustrating thepreferred arrangementiofflues and dampers for controlling the flow of theagase's between the furnacesfof the boilers and betiveen either of said furnaces andthe stack iiue.

In the above drawings y1 `represents a set- Specification of Letters Patent.

rat-enten oet. 2e, iai 7.

Serial No.11,766.

ting jivhich in the present instance is shown as provided with a vertical longitudinally extending partition v2 whereby it is divided into tivo independent chambers in each of `which are mounted the 'various `parts constituting a complete steam boiler. While the detail construction and fg'eneral design .of these boiler units-i immaterial, I have illustrated in :the present instance yboilers ofthe water tube type each including a steam drum 3, Aa. series of Water tubes 4 and front and rear headers 5 and 6 whereby these tubes are connected to each other. fis is common in the type of boiler shovvn, the front headers are connected'to the front of 'the steam drum 3. While the rear headers are similarly connected'through a suitable number of conduits 7 with the rear end of said drum. Each of the units likewisev includes a mud drum S, a furnace 9, an ash pit'lO and bathe Walls 11 andA 12 whereby products of combustion from the furnace are compelled to circulate around the tubes before being delivered through an outlet opening" indicatedat 13 inonevcase and at 14 in the case of thel secondboiler, at therear of the inclosing-'casing or setting. y y

r-McordinfT .to my invention the outlet 13 of .the boiler unit X has a continuation or extension in the form of achamber l5 coniniunicating through an ,opening 16 With Va stack flue .17 and through an opening 18 with the interior of a chamber 19 which inl this caseLis immediately below it. `Similarly* the outlet .1% of the boiler lunit Y has anextension forming a chamber 2O connected through an 'openingl with the stack flue and 'through a second opening 22 with the This klatter chamber is 'conchamber 19. nected through two substantially parallel conduits 22S-.and 24C With the ash pits k10 of the tivo boilers X and Y.

In the chamber 15 is .mounted ya damper 25, which Ain one position closes thezopening 1G vto the stack flue and fin :a position at right Vvangles thereto closes the opening` 1S tothe chamber 19. A second damper 26 is likewise mounted'in the chamber 2O in such f manner'that' in one position it closes the opening 21 -and in its other position closes theopening. Withinthe chamber 19 are two danipers'? and 28 whereby communication With the ilues Q3 and Q4; may be openedior cut o at Will. The pivot spindle of the damper 25 has fixed to it an arm 29 which through a link 30 is connected to Aan arm 81 on the pivot spindle of the damper 27 and these parts are so arranged that the latter damper is closed when the former damper is in a position to close the opening 16 to the stack flue, but is open when the damper 25` is so adjusted to close the opening 18.

Likewise the pivot spindle of the damper Q8 has fixed to it an arm 82 connected through a link With an arm 34 on a pivot spindle of the damper 26, and the arrange nient is such that when said latter damper is in position to close the opening 22, the' damper Q8 is open, While when the damper 26 closes the opening 21, the damper 28 is closed. rlhrough links 35 and 36 the tivo arms :29 and 3e are connected to the opposite extremities of a bar 37 fixed to a shaft or spindle 38 extended over the top of the boiler to the front thereof and having fixed to its forward end a second bar 39 to Whose extremities are connected ope ating cables 40 and 41.

TJnder conditions of operation the firing of the boilers is so timed that When the unit X requires fuel, there is a clear fire in the furnace of the unit Y delivering its products of combustion Without smoke to the chamber 20 andthrough the opening 21 into the stack iiue 17, the damper 26 being in its lowered position closing the opening 2Q. When therefore the fresh fuel is delivered to the furnace 9 of the boiler X, there is produced a greater or less amount of smoke together with certain unburnt gases Which with the products of combustion, are delivered through the passage 13 into the chamber 15. By means of the cable l1, the bar 39, shaft 38, bar 37, link 86., and arm 29, the damper 25 is adjusted to the position shown Which closes the opening 1G, so that smoke and gases pass through the opening 18 into the chamber 19. The same operation which raises the damper-25, through. the link 8O and arm 31 moves the damper 27 to its closed position, and also through the link 89 and arm 34: closes the damper 26 over the opening Q2 and opens the damper 28. rlhe smoke and other gases from the boiler X therefore pass from the chamber 19, thence through the receiving flue 211 into the ash pit 10 of the boiler unit Y, and through the grate v,into the furnace 9. Here the smoke and gases are completely burned and the final products of combustion from the boiler Y' flow into the chamber 20, through the opening 21 into the stack flue 17.

When it is necessary to hre the furnace of the boiler Y, the cable flO is drawn downivardly, thus sii/inging the arm 37 so that the openings 21 and 18 are closed ivhile the entrance to the conduit 2li from the chamber 19 4is closed and that to the conduit 23 is opened. Smoke and unburnt gases from the fresh fuel supplied to the furnace of the boiler Y arenoiv delivered to the chamber 2O from whence they are forced to flow into the chamber 19, through the conduit or receiving flue 23 into the ash pit 10 of the boiler f 1 L 1X, fi om whence they are forced through the burning fuel of the furnace 9 belonging to this boiler Where said gaseswith the solid particles constituting the smoke are completely burned. rlhe products of combustion from this second boiler thenV ovv through the outlet 13 into the chamber 15 and through the opening lll-into the stack flue.

From the above description it will be evident that by firing the boilers alternately and manipulating the dampers as noted, allV gases arising from fresh fuel delivered to the furnace of either boiler are completely burned before they can possibly enter the stack flue, so that there is not only added economy due to this complete combustion but the discharge of smoke is effectually prevented.

l claim 1. The Vcombination of two Water tube boilers each having discharge flue at the back and a receiving flue extending forwardly from its back to its ash pit; a stack flue connected to said discharge flues; a chamber having openings to the under sides of the discharge fines and also to the receiving lines; With dampers placed in the discharge flues respectively in positions for each of them to close either one of the openings to the stack flue or one of those to the chamber; and other dampers for respectively cutting off the receiving fines from the chamber at will; with means for operating said dampers. u

2. rllhe combination of tivo boilers each having a discharge flue and a receiving flue of which the latter is arranged to deliver gases to the furnace of its boiler; a stack flue connected to said discharge fines; a chamber mounted under the discharge flues and over the rear ends of the receiving flues having openings to said discharge flues and also to the receiving fines; With oscillatory dampers placed in the discharge` flues respectively in positions to close either on opening to the stack flue or one to the chamber; other dampers for cutting od the flou1 from the chamber to the receiving fines at Will; With means for operating the dampers.

ln testimony'ivhereof, l have signed my name to this specification, in the presence of tvvo subscribing Witnesses.

CHARLES FREll-OFER.

Witnesses:

WILLIAM E. BRADLEY, WM. A. BARR.

Copies of this patent may be obtaine for fiveY cents each, by addressing the ,Commissioner of Eatents',

Washington, D, f2. Y 

